An electron beam travels counterclockwise in a circle in the magnetic field produced by the Helmholtz coils, as shown. Assuming that Earth's field is downward, one can conclude that
A) the Helmholtz field equals Earth's field.
B) the current in the coils moves in the same direction as the electron beam.
C) the current in the coils moves in the direction opposite to the electron beam.
D) the Helmholtz field curves in the direction of the electron beam.
E) the Helmholtz field curves in a direction opposite to the electron beam.

Question

An electron beam travels counterclockwise in a circle in the magnetic field produced by the Helmholtz coils, as shown. Assuming that Earth's field is downward, one can conclude that
A) the Helmholtz field equals Earth's field. 
B) the current in the coils moves in the same direction as the electron beam. 
C) the current in the coils moves in the direction opposite to the electron beam. 
D) the Helmholtz field curves in the direction of the electron beam. 
E) the Helmholtz field curves in a direction opposite to the electron beam.

Quizplus · Accepted Answer

The Answer of  An electron beam travels counterclockwise in a circle in the magnetic field produced by the Helmholtz coils, as shown. Assuming that Earth's field is downward, one can conclude that
A) the Helmholtz field equals Earth's field. 
B) the current in the coils moves in the same direction as the electron beam. 
C) the current in the coils moves in the direction opposite to the electron beam. 
D) the Helmholtz field curves in the direction of the electron beam. 
E) the Helmholtz field curves in a direction opposite to the electron beam.

An Electron Beam Travels Counterclockwise in a Circle in the Magnetic